Oni

Originally ferocious foot-soldiers, Oni are hideous, ogre-like creatures with sharp claws, wild hair, and long horns curling away from their skulls. They are humanoid in appearance but may have additional unnatural features such as scales, hide, or fur of deepest black color.

In legend they are depicted as wearing cloths around their waists and so assumed to be of inferior intelligence than man, but some sources have led us to think otherwise. They can actually communicate easily, both with one another in their own guttural language as well as with humans: although humans rarely survive such an encounter. In fact, they are one of the more intelligent of humanoid monsters ever created. Which is how they have managed to evade modern man as nothing but mere legend all these years.

Oni are said to be invincible and undefeatable: at the very least, they have incredible strength, speed and ferocity. They are most thoroughly known in China, but their existence has been noted widely across Asia.